JP4764225B2 - Temperature measuring method and temperature measuring structure of sintered raw material layer - Google Patents

Description

  The present invention relates to a technique for continuously and accurately measuring the temperature in a sintered raw material layer supplied and formed on a sintering machine when a sintered ore is produced by the sintering machine.

  Sintered ores, especially iron ore sintered ores, are widely used as excellent main raw materials for blast furnaces, and in the production thereof, generally using a so-called dweroid type sintering machine configured by connecting pallets on an endless belt, Sintered raw material consisting of ore powder and coke powder is sequentially supplied and filled from the supply side to the product (sintered ore) discharge side to form a sintered ore raw material layer. Further ignite and allow air to pass downward (downward ventilation), and with the movement of the raw material layer, combustion and heating are advanced toward the bottom of the layer to complete the sintering of the entire raw material layer until reaching the product discharge side Is.

  In such a manufacturing process of sintered ore, it is extremely important to know the temperature in the sintering raw material layer accurately and accurately as it is a great clue for improving the quality of the sintered ore and the manufacturing process.

  Conventionally, as a method of measuring the temperature in the sintered raw material layer, a temperature detection end is attached to the tip of the tow rope, the detection end is buried in the raw material layer, and the base end side of the tow rope is provided on the raw material charging side. A method of using a temperature measuring device provided with a pulse transmitter for measuring the pulling length of a tow rope (see Patent Document 1) has been proposed.

  In this method, a temperature detection end (thermocouple) is attached to the tip of the tow rope, and the temperature detection end is locked at a predetermined position in the raw material layer by the tow rope so that the temperature is measured. It is possible to measure the temperature at the temperature detection end at an arbitrary position in the height and width directions of the raw material layer using a tow rope. However, even if the temperature detection end is increased, only the temperature history at the specified position in the layer can be measured, and the continuous temperature history accompanying the movement of the moving raw material layer itself cannot be measured. In addition, because the tow rope and the temperature detection end at the tip of the tow rope are buried in the raw material layer, the temperature detection end is changed in the height and width directions due to changes in friction and filling conditions accompanying the movement of the raw material layer. It is difficult to measure at a precise position, and the measurement accuracy is insufficient.

  As another method for measuring the temperature in the sintering raw material layer, a vent hole forming means for forming a vent hole in parallel with the moving direction of the raw material layer is provided, and a temperature measuring probe is inserted into the vent hole forming means. A method for measuring temperature (see Patent Document 2) has been proposed. According to this method, the temperature distribution of the raw material layer can be measured steadily and gas sampling is also possible, but the measurement is performed at a specific position in the raw material layer as in the above-described conventional technology, Again, the continuous temperature history cannot be measured at an arbitrary position in the width direction of the moving raw material layer, and the measurement accuracy is not sufficient due to the influence of the movement of the raw material layer and the filling state.

  Furthermore, as another method, there is a method of measuring the temperature in the sintered raw material layer by opening the side wall of the pallet and inserting and fixing a temperature measuring probe in this part (Patent Document 3). According to this method, it is possible to measure the continuous temperature history of the moving raw material layer itself, install the probe at different positions on the pallet height, and measure the temperature distribution in the height direction of the raw material layer. Can do.

However, in this method, since the so-called cantilever support method is adopted in which the probe base is fixed to the side wall of the pallet and the temperature measuring terminal of the probe is protruded into the raw material layer, the length that can be protruded into the raw material layer is limited. In the case of a large-sized sintering machine in which the pallet length, that is, the width of the raw material layer is 4000 m or more, it is impossible to measure the central portion of the raw material layer. Moreover, it is not preferable to open the side wall of the pallet for installing the probe because of problems such as deterioration of strength.
JP-A-10-332276 JP 2000-136969 A JP 59-59839 A

  In view of such circumstances, the present invention provides a sintering raw material capable of continuously and accurately measuring a temperature history at an arbitrary position in the width and / or height direction in the moving process of the sintering raw material layer itself. Providing a temperature measuring method and a temperature measuring structure of the layer is an important issue.

  The present invention has been completed to solve such a problem, and the gist of the present invention is as follows.

That is, in the invention according to claim 1, the sintered raw material layer moves from the raw material supply side toward the product discharge side when the sintered raw material is produced by sintering the sintered raw material with a sintering machine. In the method for measuring the temperature, on the flooring on the raw material supply side of the sintering machine, the whole was formed in a ship shape composed of a frame body, and the vertical and horizontal frame members were arranged in a grid pattern. a bottom frame member, a support frame body lodging triangular prism which is fixed to the upper of the bottom frame, Ri Do from the temperature measuring terminal support beams erected between the top portion of the bottom frame and the support frame The temperature measuring terminal support beam is supported by a plurality of temperature measuring probes composed of thermocouples having an overheat usage limit of 1300 ° C. or more, with their end sides attached in the height direction , and The length from the tip of the temperature measuring probe to the compensating lead wire is 0.7 to 1.0 times the total length of the sintering machine, and Placed outside of the connected-consumable temperature measuring probe structure to a power source, a surveying temperature probe, supplied from the upper, from the raw material supply side together to bury the sintering material layer on the product discharge side, which is formed Temperature measurement of the sintering raw material layer, wherein the temperature in the layer at any position in the width and / or height direction of the raw material layer is continuously measured while moving integrally with the sintering raw material layer A method is proposed.

In addition, the invention according to claim 2 has a ship shape that is entirely constituted by a frame, and includes a bottom frame in which vertical and horizontal frame members are arranged in a lattice shape, and an upper portion of the bottom frame. lodging a triangular prism-shaped support frame body fixed to, Ri Do from the temperature measuring terminal support beams erected between the top portion of the bottom frame and the support frame, the surveying temperature terminal support beam, overheating A plurality of temperature measuring probes composed of thermocouples with a usage limit of 1300 ° C or higher are supported with their end sides attached in the height direction, and connected to the compensating lead wire from the tip of the temperature measuring probe The proposed structure proposes a temperature measuring structure for a sintering raw material layer, characterized in that the length until it is 0.7 to 1.0 times the total length of the sintering machine .

  It is possible to continuously and accurately measure a temperature history at an arbitrary position or a plurality of positions in the width and / or height direction in the moving process of the sintering raw material layer itself. In addition, a measurement structure having a simple configuration for realizing this measurement can be provided.

  Hereinafter, the contents of the present invention will be described clearly and in detail so that those skilled in the art can easily implement the contents.

  In the present invention, as a result of repeated studies to continuously measure the temperature history in the layer during the movement of the sintering raw material layer itself, it is embedded in the raw material layer and discharged from the supply side (raw material supply side) of the raw material layer. Embedding that moves together as the raw material layer moves to the ore side (product discharge side) and melts securely at the completion of sintering and does not adversely affect the quality of the product sinter or manufacturing process This problem is realized by using a consumable temperature measuring probe structure.

FIG. 1 is a perspective view showing a preferred embodiment of the embedded (buried) consumable temperature measuring probe structure. The temperature measuring probe structure P has a ship shape composed entirely of a frame, and includes a bottom frame 1 forming a bottom, a support frame 2 fixed to the top, a bottom frame 1, It consists of a temperature measuring terminal support beam 3 erected between the tops of the support frame 2. The bottom frame 1 has the vertical and horizontal frame members arranged in a lattice pattern, and has a total of six windows W of 2 × 4 rows. In addition, the two window portions located at the front portion of the bottom frame body 1 (the upper left side in FIG. 1) are completely open, but the remaining window portions, that is, the window portions located at the center of the bottom frame body 1 The window portion located at the rear portion is configured to be covered with a mesh plate 4 stretched on the upper surface of the frame member forming the window portion. The average diameter of the mesh of this mesh plate is 4 to 6 mm.

  Since the temperature measuring probe structure P has a frame shape as a whole, it maintains a certain strength and is embedded in the raw material layer and used as described later. The raw material is smoothly supplied and filled therein without impeding air permeability, and a stable posture and state as a temperature measuring probe structure are maintained in the raw material layer.

Further, since the bottom frame of the temperature measuring structure window of at least its center portion is formed is covered with a net plate, when implanted in a material layer, on the central portion of the bottom frame member The raw material of coarse particles in the raw material accumulates and fine powder passes, so there is no worry of clogging, the air permeability of the raw material layer can be maintained, and the coarse particles are deposited in the center. A more stable posture and state are maintained as the warm probe structure.

  The frame member constituting the bottom frame body 1, the support frame body 2, and the temperature measuring terminal support beam 3 are all manufactured by processing from a general carbon steel material (SS material), for example, a pipe having a thickness of 1 mm (diameter 6 mm) In addition, in order to make it easy to understand in the drawing, the diameter of the temperature measuring terminal support beam 3 is drawn larger than that of the other frames 1 and 2) The net plate 4 covering the window portion of the bottom frame 1 is also a general carbon. Made of steel (SS material). Thus, by using a general carbon steel material (SS material) as a constituent material such as a frame member, the necessary temperature history is measured and then softened and melted at the highest sintering temperature. Even if the components are incorporated into the sintered ore, they are iron and carbon, so there is no influence on the quality of the product.

As shown in the figure, the support frame 2 has an inverted isosceles triangular prism shape, and the lower ends of the frame members forming the isosceles sides of the isosceles triangle located on the front side and the back side are in the center of the bottom frame 1. The four window portions W are fixed to frame members located at the four corners of the whole.

  As described above, the support frame 2 is configured in the shape of an isosceles triangular prism so that the influence of the weight of the raw material from above when embedded in the raw material layer is extremely small, and the temperature measuring terminal is supported with high structural strength. The beam 3 can be supported.

  A typical dimensional configuration of the whole temperature measuring probe structure P composed of the bottom frame 1, the support frame 2, and the temperature measuring terminal support beam 3 is illustrated in FIG.

  The temperature measuring terminal support beam 3 has its upper end fixed to the center of the top (top) frame member of the support frame 2 and its lower end perpendicular to the intersection of the frame members that bisect the vertical and horizontal directions of the bottom frame 1. It is fixed to.

  As shown in detail in FIG. 2, the temperature measuring terminal support beam 3 supports three temperature measuring probes 5 made of a sheathed thermocouple or the like with their end portions attached. This attachment is performed by binding the temperature measuring probe 5 to the support beam 3 with a binding wire (not shown) such as a wire. In this case, considering the change in the thermal effect in the raw material layer, The temperature measuring probe 5 allows the expansion and contraction of each other and binds loosely to the extent that it does not come off.

  The temperature measuring terminals 5a, 5b, and 5c at the tip of the temperature measuring probe 5 are positioned at three positions in the upper, middle and lower portions of the support beam 3 in front of the temperature measuring probe structure P (raw material layer). It is in a state where it is bent horizontally toward the movement direction. The end portions of the two temperature measuring probes 5 corresponding to the temperature measuring terminals 5a and 5b are supported along the support beam up to the lower end of the support beam 3, and at the lower end of the support beam 3, the temperature measurement terminal 5c is supported. Are bent horizontally toward the rear (corresponding to the direction opposite to the direction of movement of the raw material layer) together with three temperature measuring probes 5 corresponding to the Wiring is performed horizontally along the lower surface of the raw material layer.

  Here, the temperature measuring probe 5 is arranged in a horizontal form at the upper surface position of the bottom frame 1 after the lower end of the support beam 3 as will be described later. When the measurement is carried out by embedding in the raw material layer, the temperature measuring probe 5 is connected to the lower surface (between the lower surface of the raw material layer and the upper surface of the floor layer) that has the lowest thermal load of the raw material layer that is burned and heated by downward ventilation ) Is placed and held at the position of () to minimize the thermal effects associated with the sintering operation.

  These three temperature measuring probes 5 are connected to a measuring device including a nearby external power source and a detection unit, a converter, a data processing unit, and the like via a compensation lead wire (not shown). In this case, the total length of the temperature measuring probe 5 (the length from the tip to the connection to the compensating conductor) is 0.7 to 1.0 times the total length of the sintering machine. The lower limit is 0.7 times because the position where the entire raw material layer (lowermost layer) completes sintering is about 80% from the raw material supply end of the sintering machine (about 20% from the product discharge end). This is because the temperature can be reliably measured even in a state where it is buried in the raw material layer to be heated and sintered at least up to this position. In other words, if a compensating lead wire is connected to this with a length less than 0.7 times, the compensation lead wire is also maintained in the high temperature raw material layer, so there is a high risk of burning, and the temperature measurement to the position where the sintering is completed is performed. This is because it becomes difficult to perform continuously. The temperature measuring probe 5 protected by the covering material and the sheath can accurately measure the temperature measuring function without deterioration even in the high temperature raw material layer. On the other hand, as for the lower limit, the full length of the sintering machine is sufficient even if it is the longest to achieve this purpose, and even if the extra length is longer than this, the cost of the temperature measuring probe 5 increases unnecessarily and causes a disadvantage. It is.

  The thermocouple applied to the temperature measuring probe 5 should have a high heat resistance of at least 1200 ° C., preferably 1300 ° C. or higher, such as JIS N type, R type, S type and B type. Is used.

  An example of a specific dimensional configuration of the height position of the support beam 3 of each temperature measuring terminal is as shown in FIG.

  Next, a method for measuring the temperature in the sintering material layer using the temperature measuring probe structure P of this embodiment will be described.

  FIG. 4 is a schematic perspective view showing a formation state of a sintered raw material layer in the vicinity of a raw material supply section of a dweroid-type sintering machine. In the figure, M is a raw material, SL is a sintered raw material layer, BL is a floor laid on the bottom of the pallet, 11 is a feed hopper, 12 is a drum feeder, 13 is a charging chute, and 14 is a cut-off. Each gate is shown.

  The raw material M in the feed hopper 11 mixed and adjusted with water such as ore powder, coke powder, etc. is sequentially dropped and loaded on the floor in the pallet through the drum feeder 12 and the charging chute 13. A sintered raw material layer SL is formed, and this raw material layer SL moves at the speed of the pallet in the direction of the arrow on the product discharge side.

In the present invention, the temperature measuring probe structure P which had been prepared in advance at the time of measurement, grips and operates the handling machine, the raw material is supplied, only the bedding behind the loading (front side) was laid on the bottom Guide to the upper space of the empty floor pallet that is 2-4 units ahead of the pallet that is not being supplied among the unsupplied pallets (floor empty pallet), and then to the target width direction location After positioning parallel to the movement direction of the pallet, it is gently placed on the flooring BL in the pallet.

The temperature measuring probe structure P in the pallet with the movement of the pallet, and advanced to a position where raw materials are fed, wherein the raw material is fed into the same pallet, temperature measuring probe structure P by being stacked Is embedded in the raw material layer SL.

  After that, the temperature measuring probe structure P is moved toward the product discharge side together with the raw material layer SL along with the movement of the pallet while being completely embedded in the raw material layer SL.

  In this way, three different temperature histories in the height direction in the raw material layer in which the temperature measuring terminals 5a, 5b, 5c attached to the temperature measuring probe structure P are located are continuously obtained until the sintering is completed. It becomes possible to measure with high accuracy.

  Of course, by increasing the number of temperature measuring terminals (or temperature measuring probes) of the temperature measuring probe structure P to 4 or more, or by providing a temperature measuring terminal supporting beam spanning the support frame 2 in the width direction, By using a plurality of temperature measuring probe structures P themselves and simultaneously embedding them at different positions in the width direction of the raw material layer, the temperature history at any position and any number of measurement points in the raw material layer is continuously obtained. Can be measured automatically.

  By the way, the temperature measurement probe structure P softens and melts after passing the sintering completion temperature (about 1300 ° C.) and is taken into the product sintered ore, but the main body of the structure is mainly composed of iron and carbon. The probe sheath is mainly composed of iron, and the thermocouple element protective material is magnesia, alumina, etc., and the thermocouple is a trace metal component, so there is no influence on the product.

(Example)
A temperature measuring structure having the dimensions shown in FIG. 3 (frame member, temperature measuring terminal support beam is a 6 mm diameter SS pipe) is manufactured, and two probes are connected to each temperature measuring terminal (temperature measuring point). A temperature measuring probe structure was prepared by binding with a wire such that the position of the temperature measuring terminal supporting beam was 450 mm and 50 mm (corresponding to the raw material layer height). The temperature measuring probe has an overall length of 80 m, and a thermocouple wire (JIS-R type, diameter: 1 mm) is covered with a three-layer alumina ceramic sheet, which is surrounded by an alumina ceramic filler, and further outside is stainless steel. A cross section covered with a sheath knitted in a mesh shape with a thin wire was adopted that has an elliptical shape (major axis: 4.5 mm, minor axis: 3 mm).

Therefore, Dowai toroidal type sintering machine (length: 100 m, pallets Width: 4m) actual operation by (pallet velocity; 4.2~4.5m / min) in the measured described above the temperature measuring probe structure method In the same way as above, the floor pallet 3 floors ahead (3rd) from the pallet that is supplying the raw material is the target and placed on the floor in the center in the width direction, that is, the width direction of the material layer. Then, the measurement was carried out by embedding in the raw material layer by moving the pallet.

  The result is shown in FIG. This figure is a graph showing the relationship between the distance from the wind box end (position where the temperature measuring probe structure is embedded) (raw material supply and layer height of 450 mm (solid line) and 50 m (broken line)). Thus, according to the present invention, it is found that the temperature history at any and a plurality of positions in the raw material layer can be measured with high accuracy.

It is a perspective view which shows embodiment of the temperature measurement probe structure which concerns on this invention. It is a perspective view which shows the attachment state of the temperature measuring probe to the temperature measuring terminal support beam in the same embodiment which concerns on this invention. It is the perspective view which illustrated the dimension structure of the temperature measuring probe structure which concerns on this invention. It is a typical perspective view which shows the formation state of the sintering raw material layer of the raw material supply part vicinity of the dwyroid type sintering machine explaining the measuring method in the sintered ore raw material layer which concerns on this invention. It is a graph which shows the relationship between the distance (layer height 450mm (real gland) and 50m (dashed line)) from the wind-box edge (position which embedded the temperature-measurement probe structure) by the Example of this invention, and temperature.

Explanation of symbols

P: Temperature measuring probe structure 1: Bottom frame 2: Support frame 3: Temperature measuring terminal support beam 4: Net plate 5: Temperature measuring probe 5a, 5b, 5c: Temperature measuring terminal M: Raw material SL: Sintered raw material Layer BL: Flooring 11: Feeding hopper 12: Drum feeder 13: Charging chute 14: Cut-off gate

Claims (2)

In the method of measuring the temperature inside the sintered raw material layer moving from the raw material supply side toward the product discharge side when the sintered raw material is produced by sintering the sintered raw material with a sintering machine, the sintering The floor frame on the raw material supply side of the machine has a ship shape composed entirely of a frame body, and a bottom frame body in which the vertical and horizontal frame members are arranged in a grid, and the bottom frame body lodging a triangular prism-shaped supporting frame member which is fixed to the upper, Ri Do from the temperature measuring terminal support beams erected between the top portion of the bottom frame and the support frame, the surveying temperature terminal support beam, A plurality of temperature measuring probes composed of thermocouples with an overheat usage limit of 1300 ° C. or more are supported with their end portions attached in the height direction , and from the tip of the temperature measuring probe to the compensating lead wire length to be connected is a 0.7 to 1.0 times the sintering machine the overall length, and measuring consumable connected to an external power source The probe structure is placed, and the temperature measurement probe is supplied from above and buried in the formed sintering material layer, and moves integrally with the sintering material layer from the material supply side to the product discharge side. A method for measuring the temperature of a sintered raw material layer, wherein the temperature in the layer at an arbitrary position in the width and / or height direction of the raw material layer is continuously measured. A bottom frame body in which the vertical and horizontal frame members are arranged in a lattice shape, and a supporting triangular prism-shaped support frame fixed to the top of the bottom frame body body and, Ri Do from the temperature measuring terminal support beams erected between the top portion of the bottom frame and the support frame, the surveying warm terminals supporting beam, thermocouple overheating allowable limit is 1300 ° C. or higher A plurality of temperature measuring probes constituted by the above are supported in a state where the end portions are attached in the height direction, and the length from the tip of the temperature measuring probe to the connection to the compensating lead wire is sintered. A temperature measuring structure of a sintering raw material layer, which is 0.7 to 1.0 times the total length of the machine .

Images